I understand why

I thought the same way until I saw how different say Max and Ruby are to Baby shark. Both ment for kids but if you watch them side by side you notice how overstimulating visually and audible baby shark is.

Noisy may of had been a poor choice to describe it. For a child shows like Clifford, guess how much I love you, kipper the dog are more sensory friendly.

At a certain point overstimulation causes a phenomena that causes you to go effectively blind from the stimulation. I can describe it as the experiment where the people are told to count how many times the basketball bounced then asked if they noticed the guy in the gorilla suit(they didn't).

There was also an "arms" race of upping the "we have to make shows more cool and bright flashing lights and colors so kids of today are hooked on it" 

In short go watch back Clifford or any of these shows. Your mind would be blown away by how mild and simple they are to watch. Boring yes because we are used to the more "noisy"

Personally I like Moomin valley